It's part of a word game he played on The Tonight Show last night, but he doesn't seem to know what it means.

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Last night, Breaking Bad star Bryan Cranston stopped by the Tonight Show to chat with host Jimmy Fallon about his starring role in the upcoming Godzilla movie. But instead of having a boring old regular conversation, Fallon decided to play a game called “Word Sneak” that required them to slip random words into the conversation as seamlessly as possible. As you can imagine, things got real silly real fast.

Cranston does a pretty good job overall, aside from the fact that he apparently has no idea what the word “badonkadonk” means — slang for female buttocks, in case you were wondering, too.